MySQL raises this error when slave_preserve_commit_order is set on a server version or replication setup that does not support commit-order preservation.
MySQL error 3031 ER_DONT_SUPPORT_SLAVE_PRESERVE_COMMIT_ORDER appears when the variable slave_preserve_commit_order is enabled on a replica that lacks support for commit-order preservation. Disable the variable or upgrade to MySQL 5.7.5+ to resolve the issue.
ER_DONT_SUPPORT_SLAVE_PRESERVE_COMMIT_ORDER
MySQL error 3031 appears when the slave_preserve_commit_order system variable is set on a replica that cannot honor commit-order preservation. The feature was introduced in MySQL 5.7.5, so older versions or certain replication modes refuse the setting and raise the error.
The error stops replication startup or configuration changes, leaving the replica unable to apply new transactions. Fixing it quickly restores replication and prevents data lag.
The error surfaces if you upgrade partial components, run mismatched server versions, or copy a my.cnf file that enables slave_preserve_commit_order on nodes that do not support the feature.
It also occurs when semisynchronous or group-replication plugins are absent, because commit-order preservation relies on their internal bookkeeping.
The quickest fix is to disable the variable and restart the replica. When you need commit-order preservation, upgrade the replica to MySQL 5.7.5 or newer and ensure binary logging and GTID replication are enabled.
After the upgrade, enable the variable dynamically or in the configuration file, then restart replication to confirm that the error no longer occurs.
During version upgrades, temporarily comment out the variable in my.cnf to allow the replica to start, then re-enable it after the server is on a compatible version.
In containerized deployments, set SLAVE_PRESERVE_COMMIT_ORDER only for images tagged 5.7.5-plus to avoid surprises when rolling back to older images.
Standardize server versions across primary and replicas and automate configuration validation to catch unsupported settings before rollout.
Include slave_preserve_commit_order in a feature-flag group so it is toggled only when the running version explicitly supports it.
Error 1231 (ER_UNKNOWN_SYSTEM_VARIABLE) appears when the variable name is completely unknown, often due to spelling mistakes. The remedy is to correct the variable key.
Error 1965 (ER_MIXING_GTID_CHANGE_WITH_DD_CHANGE) surfaces during GTID changes in replication. Ensure GTID consistency before altering replication settings.
slave_preserve_commit_order is recognized only from 5.7.5 onward. Setting it on 5.6 or earlier triggers the error.
If semisynchronous or group replication plugins are not loaded, the server may not provide required hooks for commit-order preservation.
Cloning my.cnf from a higher version to a lower version instance keeps the variable enabled and produces the error at startup.
Upgrading the binary but not the data directory or shared libraries can leave the feature unusable, leading to error 3031.
Raised when an undefined system variable is referenced. Check spelling and server version.
Occurs during simultaneous GTID and data definition changes. Apply changes in separate steps.
Indicates GTID_PURGED cannot be set due to constraints. Ensure GTID sets are consistent before altering.
No. The server refuses to start replication when the variable is unsupported, so you must disable it or upgrade.
It improves data consistency in multicore replicas but may add slight latency. Benchmark after enabling.
Group Replication automatically sets commit order. You only need the variable for traditional asynchronous replicas.
Galaxy highlights unsupported system variables in the editor and flags configuration drift before deployment, reducing replication outages.
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